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A normal-shaped distribution has µ=80 and σ=15. What are the z-score values that form the boundaries for the middle 95% of the distribution of sample means? Compute the z-score for M=89 for a sample of n=25 scores. Is this sample mean in the middle 95% of the distribution?
Cash withdrawals (in multiples of $20) at an on-campus ATM for a random sample of 30 Fridays and 30 Mondays are shown below.
Marketing firm asked the random set of married and single men as to how much they were eager to spend for vacation. At alpha= .05, is a difference in two amounts?
Each inspector makes his or her inspection at a different time. What is the probability that at least one inspector will find a defective widget?
A spokesman for a popular television game show claims that contestants on the show win an average of $1200. In a random sample, 35 contestants were questioned on the amount of money they had won in order to test the hypothesis.
Please explain the difference between confidence interval and significance level and how they interact or "influence" each other.
The data collected was for each car for each type of fuel. Performance was measured in miles per gallon. Perform an ANOVA test and state the results.
Let z be a standard normal random variable and calculate the following probabilities:
Construct a sample space using a tree diagram - Which of the following three sets of probabilities are inappropriate because they violate a basic rule of probability
Explain the distribution of mean of samples of size 15.
A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n = 9 students is obtained and each student is given the normal dose of the medicine.
What's the probability that among three randomly selected high school students
Find a 95% confidence interval for the mean dielectric strength of the oil.
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